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Frank Menzel was kind enough to take a look at the male. He identified it as Scatopsciara calamophila. To answer Svavar, the keys that would allow specific identification of S. calamophila that I found are in Tuomikoski 1960 (Zur Kenntnis der Sciariden (Dipt.) Finnlands. - Ann . Zool. Soc. "Vanamo" . - Helsinki , 21 (4): 1 - 164) and in Frey 1942 (Entwurf einer neuen Klassifikation der Mückenfamilie Sciaridae (Lycoriidae). - Notul. Ent. - Helsingfors [Helsinki], 22: 5-44). Note that Frey says that y = 1/3 x for S. calamophila, which is disputed by Tuomikoski who notes that y = x in this species and which is also what I found in my specimen (see image below).